linux-kernel - [PATCH 2/2, powerpc/powernv] powerpc/powernv: Tweak PCI_DEV_FLAGS_QUIET_PCI

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Date:   Wed, 14 Mar 2018 13:34:55 -0300
From:   "Desnes A. Nunes do Rosario" <desnesn@...ux.vnet.ibm.com>
To:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Cc:     bhelgaas@...gle.com, benh@...nel.crashing.org, paulus@...ba.org,
        mpe@...erman.id.au, ruscur@...sell.cc, aik@...abs.ru,
        david@...son.dropbear.id.au, fbarrat@...ux.vnet.ibm.com,
        brking@...ux.vnet.ibm.com
Subject: [PATCH 2/2, powerpc/powernv] powerpc/powernv: Tweak PCI_DEV_FLAGS_QUIET_PCI_REALIGN on/off during boot

Turn on PCI_DEV_FLAGS_QUIET_PCI_REALIGN flag on powernv's pci driver
to silent PCI realignment messages through a early stage hook, and turn
it off right before the pci device is enabled with a final stage hook.

Fixes: 38274637699 ("powerpc/powernv: Override pcibios_default_alignment() to force PCI devices to be page aligned")
Signed-off-by: Desnes A. Nunes do Rosario <desnesn@...ux.vnet.ibm.com>
---
 arch/powerpc/platforms/powernv/pci.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/powerpc/platforms/powernv/pci.c b/arch/powerpc/platforms/powernv/pci.c
index 69d102cbf48f..d28ce0899487 100644
--- a/arch/powerpc/platforms/powernv/pci.c
+++ b/arch/powerpc/platforms/powernv/pci.c
@@ -1108,6 +1108,20 @@ static void pnv_p7ioc_rc_quirk(struct pci_dev *dev)
 }
 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_IBM, 0x3b9, pnv_p7ioc_rc_quirk);
 
+/* Fixup that disables PCI realignment menssages for all PCI devices */
+static void disable_realign_menssages(struct pci_dev *dev)
+{
+	dev->dev_flags |= PCI_DEV_FLAGS_QUIET_PCI_REALIGN;
+}
+DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, disable_realign_menssages);
+
+/* Fixup that enables PCI realignment messages for all PCI devices */
+static void enable_realign_menssages(struct pci_dev *dev)
+{
+	dev->dev_flags ^= PCI_DEV_FLAGS_QUIET_PCI_REALIGN;
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, enable_realign_menssages);
+
 void __init pnv_pci_init(void)
 {
 	struct device_node *np;
-- 
2.14.3